The 2009 ATP Studena Croatia Open Umag was a tennis tournament played on outdoor red clay courts. It was the 20th edition of the event known that year as the ATP Studena Croatia Open Umag and was part of the ATP World Tour 250 series of the 2009 ATP World Tour. It took place at the International Tennis Center in Umag, Croatia, from 27 July through 2 August 2009. First-seeded Nikolay Davydenko won the singles title.

Entrants

Seeds

*Seedings based on the July 20, 2009 rankings.

Other entrants

The following players received wildcards into the singles main draw The following players received entry from the qualifying draw:

Finals

Singles

🇷🇺 Nikolay Davydenko defeated 🇪🇸 Juan Carlos Ferrero, 6–3, 6–0.

Doubles

🇨🇿 František Čermák / 🇸🇰 Michal Mertiňák defeated 🇸🇪 Johan Brunström / Jean-Julien Rojer, 6–4, 6–4.